If you are wondering about the "ethics" of E-bikes this TedX talk from Zach Krapfl is worth the watch. Actually, it's worth the watch no matter. I like the 500 mpg and potential 1500 mpg calculations. Zach used to design really cool bikes for Schwinn when the company was based in the Boulder area. He would be a great resource for Solar and other installs on the Western Slope of Colorado where hs new company, Clean State Energy is based.